I think its pretty false to say that they are just copying Russian/NASA engines. While of course much of the basic research was done long before they started and they profit from it.

Both SpaceX and BlueOrigin have gone way beyond what either Russia or NASA ever did or are doing at the moment.

The SLS is a legacy rocket with legacy technology.

It will go down as the biggest waste of money in space history. I should be cancelled as soon as possible.